[al-Maa’idah 5:90]
In Saheeh al-Bukhaari (2295) and Saheeh Muslim (86) it is narrated that Abu Hurayrah (may Allaah be pleased with him) said: the Prophet (peace and blessings of Allaah be upon him) said: “No one who commits zina is a believer at the moment when he is committing zina, and no one who drinks wine is a believer at the moment when he is drinking it, and no thief is a believer at the moment when he is stealing, and no robber is a believer at the moment when he is robbing and the people are looking on.” This means that such a person is not a believer in the sense of having complete faith, rather his faith is greatly lacking because of this evil action.
It is also narrated in al-Bukhaari (5147) and Muslim (3736) from ‘Abd-Allaah ibn ‘Umar (may Allaah be pleased with them both) that the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever drinks wine in this world and does not repent from that, he will be deprived of it in the Hereafter.”
In Sunan Abi Dawood (3189) it is narrated that Ibn ‘Umar (may Allaah be pleased with them both) said: the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Allaah has cursed alcohol, the one who drinks it, the one who pours it, the one who sells it, the one who buys it, the one who squeezes it (squeezes the grapes, etc), the one for whom it is squeezed, the one who carries it and the one to whom it is carried.” (Classed as saheeh by al-Albaani in Saheeh Abi Dawood, 2/700)